tert-butyl (1S,3R,5R,6R)-3-methyl-14-oxo-1-(2-oxoethyl)-5-((trimethylsilyl)oxy)-10-azaspiro[5.8]tetradecane-10-carboxylate

tert-butyl (1R,3R,5R,6R)-1-allyl-5-hydroxy-3-methyl-14-oxo-10-azaspiro[5.8]tetradecane-10-carboxylate

tert-butyl (3-((tert-butyldiphenylsilyl)oxy)propyl)(4-hydroxybutyl)carbamate

(5R)-5-methylcyclohex-2-enone

tert-butyl (4-((2R,4R)-2-allyl-4-methyl-6-oxocyclohexyl)-4-oxobutyl)(3-iodopropyl)carbamate